Synonyms: dashing hopes, disappointment
Definition: an act (or failure to act) that disappoints someone
Similar words: failure
Definition: an unexpected omission
Usage: he resented my failure to return his call; the mechanic's failure to check the brakes
Synonyms: disappointment, letdown
Definition: a feeling of dissatisfaction that results when your expectations are not realized
Usage: his hopes were so high he was doomed to disappointment
Similar words: dissatisfaction
Definition: the feeling of being displeased and discontent
Usage: he was never slow to express his dissatisfaction with the service he received